:root {
  --brand: #0088cc;
  --brand-dark: #006699;
  --brand-light: #e8f4fb;
  --brand-pale: #f4fafd;
  --navy: #0d2d4a;
  --navy-light: #1a4a6e;
  --gray-50: #f7f9fb;
  --gray-100: #eef2f6;
  --gray-400: #94a3b8;
  --gray-600: #5a6b7d;
  --gray-800: #2d3748;
  --white: #ffffff;
  --shadow: 0 2px 16px rgba(13, 45, 74, 0.08);
  --shadow-lg: 0 8px 32px rgba(13, 45, 74, 0.12);
  --radius: 4px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  font-family: "Segoe UI", "Microsoft JhengHei", "PingFang TC", sans-serif;
  color: var(--gray-800);
  background: var(--white);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1140px, 92%);
  margin: 0 auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 3px solid var(--brand);
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
  gap: 1.5rem;
}

/* Brand mark */
.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  text-decoration: none;
  min-width: 0;
}

.logo__mark {
  width: 46px;
  height: 46px;
  object-fit: contain;
  flex: 0 0 auto;
}

.logo__text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.35rem;
  min-width: 0;
}

.logo__zh {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--navy);
  line-height: 1.1;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.logo__rule {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--gray-100);
}

.logo__en {
  font-size: 0.625rem;
  font-weight: 500;
  color: var(--gray-600);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  line-height: 1.2;
  white-space: nowrap;
}

@media (max-width: 900px) {
  .logo__mark {
    width: 40px;
    height: 40px;
  }

  .logo__zh {
    font-size: 1.35rem;
  }

  .logo__en {
    font-size: 0.55rem;
    letter-spacing: 0.06em;
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 0.75rem 0;
  }

  .logo {
    gap: 0.55rem;
  }

  .logo__mark {
    width: 34px;
    height: 34px;
  }

  .logo__zh {
    font-size: 1.08rem;
    letter-spacing: 0.02em;
  }

  .logo__rule,
  .logo__en {
    display: none;
  }
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex-wrap: wrap;
}

.nav > a,
.nav-trigger {
  padding: 0.55rem 1rem;
  font-size: 0.95rem;
  color: var(--gray-600);
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav > a:hover,
.nav > a.active,
.nav-trigger:hover,
.nav-item--dropdown.is-open > .nav-trigger,
.nav-item--dropdown:hover > .nav-trigger,
.nav-item--dropdown:focus-within > .nav-trigger {
  color: var(--brand-dark);
  border-bottom-color: var(--brand);
}

.nav-item--dropdown {
  position: relative;
}

.nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  font: inherit;
  text-decoration: none;
}

.nav-trigger.active {
  color: var(--brand-dark);
  border-bottom-color: var(--brand);
}

.nav-caret {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.7;
  transition: transform 0.2s;
}

.nav-item--dropdown:hover .nav-caret,
.nav-item--dropdown:focus-within .nav-caret,
.nav-item--dropdown.is-open .nav-caret {
  transform: rotate(180deg);
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 0.35rem);
  left: 0;
  min-width: 200px;
  background: var(--white);
  border: 1px solid var(--gray-100);
  box-shadow: var(--shadow-lg);
  border-radius: 8px;
  padding: 0.4rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.18s, transform 0.18s, visibility 0.18s;
  z-index: 200;
}

.nav-item--dropdown:hover > .nav-dropdown,
.nav-item--dropdown:focus-within > .nav-dropdown,
.nav-item--dropdown.is-open > .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown__group {
  position: relative;
}

.nav-dropdown__parent {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1.1rem;
  color: var(--navy);
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
}

.nav-dropdown__parent:hover,
.nav-dropdown__group:hover > .nav-dropdown__parent,
.nav-dropdown__group:focus-within > .nav-dropdown__parent,
.nav-dropdown__group.is-open > .nav-dropdown__parent {
  background: var(--brand-pale);
  color: var(--brand-dark);
}

.nav-dropdown__arrow {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.55;
  flex-shrink: 0;
  transition: transform 0.2s;
}

.nav-dropdown__group:hover > .nav-dropdown__parent .nav-dropdown__arrow,
.nav-dropdown__group:focus-within > .nav-dropdown__parent .nav-dropdown__arrow,
.nav-dropdown__group.is-open > .nav-dropdown__parent .nav-dropdown__arrow {
  transform: rotate(180deg);
}

.nav-dropdown__sub {
  display: none;
  padding: 0 0 0.35rem;
  background: var(--gray-50);
}

.nav-dropdown__group:hover > .nav-dropdown__sub,
.nav-dropdown__group:focus-within > .nav-dropdown__sub,
.nav-dropdown__group.is-open > .nav-dropdown__sub {
  display: block;
}

.nav-dropdown__sub a {
  display: block;
  padding: 0.55rem 1.1rem 0.55rem 1.75rem;
  color: var(--gray-600);
  font-size: 0.88rem;
  border-bottom: none;
  white-space: nowrap;
}

.nav-dropdown__sub a:hover {
  background: var(--brand-pale);
  color: var(--brand-dark);
  border-bottom: none;
}

.nav-cta {
  background: var(--brand) !important;
  color: var(--white) !important;
  border-bottom: none !important;
  border-radius: var(--radius);
  margin-left: 0.5rem;
  font-weight: 600;
}

.nav-cta:hover {
  background: var(--brand-dark) !important;
  color: var(--white) !important;
}

.nav-lang {
  /* kept for lang-detect.js click handler */
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  margin-left: 0.65rem;
  padding: 3px;
  background: linear-gradient(180deg, var(--gray-100) 0%, #e8edf2 100%);
  border-radius: 999px;
  border: 1px solid rgba(13, 45, 74, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.75);
  gap: 2px;
  flex-shrink: 0;
}

.lang-switch__item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.55rem;
  padding: 0.34rem 0.72rem;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray-600);
  border: none !important;
  border-bottom: none !important;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  line-height: 1.2;
  white-space: nowrap;
}

.lang-switch a.lang-switch__item {
  color: var(--gray-600) !important;
}

.lang-switch__item:not(.is-active):hover {
  color: var(--brand-dark) !important;
  background: rgba(255, 255, 255, 0.65);
}

.lang-switch__item.is-active {
  background: var(--white);
  color: var(--brand-dark);
  box-shadow: 0 1px 5px rgba(13, 45, 74, 0.14);
  cursor: default;
}

@media (max-width: 900px) {
  .lang-switch {
    margin: 0.5rem 0 0.15rem;
    align-self: flex-start;
  }
}

@media (max-width: 900px) {
  .nav-dropdown {
    position: static;
    min-width: 0;
    width: 100%;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding: 0;
    margin: 0.15rem 0 0.35rem;
    display: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    background: var(--gray-50);
  }

  .nav-item--dropdown.is-open > .nav-dropdown {
    display: block;
  }

  .nav-dropdown__group {
    border-bottom: 1px solid var(--gray-100);
  }

  .nav-dropdown__group:last-child {
    border-bottom: none;
  }

  .nav-dropdown__sub {
    background: transparent;
  }

  .nav-dropdown__sub a {
    padding-left: 1.75rem;
  }
}

/* Hero */
.hero {
  color: var(--white);
  padding: 4rem 0 3rem;
  position: relative;
  overflow: hidden;
  min-height: 0;
  display: flex;
  align-items: center;
  background: var(--navy);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 72% center;
  display: block;
}

.hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      90deg,
      rgba(13, 45, 74, 0.96) 0%,
      rgba(13, 45, 74, 0.88) 38%,
      rgba(13, 45, 74, 0.55) 62%,
      rgba(13, 45, 74, 0.28) 100%
    ),
    linear-gradient(
      180deg,
      rgba(13, 45, 74, 0.25) 0%,
      transparent 35%,
      rgba(13, 45, 74, 0.35) 100%
    );
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero-tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 0.3rem 0.85rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: clamp(1.85rem, 4vw, 2.65rem);
  line-height: 1.28;
  margin-bottom: 1rem;
  font-weight: 700;
  max-width: 16em;
}

.hero p {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 560px;
  margin-bottom: 1.5rem;
  line-height: 1.85;
}

.text-nowrap {
  white-space: nowrap;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-why {
  margin-top: 2.25rem;
  padding-top: 1.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-why__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.hero-why__title {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.95);
}

.hero-why__more {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.75);
  white-space: nowrap;
}

.hero-why__more:hover {
  color: var(--white);
}

.hero-why__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem 1.5rem;
}

.hero-why__item strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--white);
}

.hero-why__item span {
  display: block;
  font-size: 0.84rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.72);
}

@media (max-width: 768px) {
  .hero {
    min-height: 0;
    padding: 3rem 0 2.5rem;
  }

  .hero__bg-img {
    object-position: 85% center;
  }

  .hero__bg::after {
    background: linear-gradient(
      180deg,
      rgba(13, 45, 74, 0.92) 0%,
      rgba(13, 45, 74, 0.82) 55%,
      rgba(13, 45, 74, 0.72) 100%
    );
  }

  .hero h1 {
    max-width: none;
  }

  .hero-why {
    margin-top: 1.75rem;
    padding-top: 1.5rem;
  }

  .hero-why__grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s, transform 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--brand);
  color: var(--white);
}

.btn-primary:hover {
  background: #00a0e3;
  transform: translateY(-1px);
}

.btn-outline-light {
  background: transparent;
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.6);
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-outline {
  background: var(--white);
  color: var(--brand-dark);
  border: 1px solid var(--brand);
}

.btn-outline:hover {
  background: var(--brand-light);
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section--gray {
  background: var(--gray-50);
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-header h2 {
  font-size: 1.65rem;
  color: var(--navy);
  margin-bottom: 0.4rem;
}

.section-header p {
  color: var(--gray-600);
  max-width: 600px;
}

.section-header--row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
  flex-wrap: wrap;
}

.link-more {
  color: var(--brand);
  font-weight: 600;
  font-size: 0.9rem;
}

.link-more:hover {
  color: var(--brand-dark);
}

/* Product grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.product-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-top: 3px solid var(--brand);
  transition: box-shadow 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.product-card__img {
  height: 220px;
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  overflow: hidden;
  cursor: pointer;
  transition: background 0.15s;
}

a.product-card__img:hover {
  background: var(--brand-pale);
}

.product-card__photo {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
}

.product-card__body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-card__tag {
  font-size: 0.75rem;
  color: var(--brand);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}

.product-card h3 {
  color: var(--navy);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.product-card p {
  color: var(--gray-600);
  font-size: 0.92rem;
  flex: 1;
  margin-bottom: 1rem;
}

.product-card__link {
  display: inline-block;
  color: var(--brand);
  font-weight: 600;
  font-size: 0.88rem;
  margin-top: 0.35rem;
  margin-right: 1rem;
}

.product-card__link:hover {
  color: var(--brand-dark);
}

.spec-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.spec-summary__item {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.spec-summary__label {
  display: block;
  font-size: 0.82rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}

.spec-summary__item strong {
  display: block;
  color: var(--navy);
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.spec-summary__item span:last-child {
  font-size: 0.88rem;
  color: var(--gray-600);
}

.spec-note {
  color: var(--gray-600);
  font-size: 0.9rem;
  line-height: 1.8;
  margin: 0;
}

.spec-note a {
  color: var(--brand);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.spec-note a:hover {
  color: var(--brand-dark);
}

.spec-table-wrap {
  overflow-x: auto;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.93rem;
}

.spec-table th,
.spec-table td {
  padding: 1rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: top;
}

.spec-table th {
  background: var(--brand-pale);
  color: var(--navy);
  font-weight: 600;
  white-space: nowrap;
}

.spec-table tbody tr:last-child td {
  border-bottom: none;
}

.power-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.power-chip {
  display: inline-block;
  padding: 0.4rem 0.85rem;
  background: var(--brand-pale);
  color: var(--brand-dark);
  border: 1px solid var(--brand-light);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: background 0.15s, color 0.15s;
}

.power-chip:hover {
  background: var(--brand);
  color: var(--white);
  border-color: var(--brand);
}

.spec-table-cta {
  margin-top: 1rem;
  margin-bottom: 0;
}

.drawing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.drawing-grid--4 {
  grid-template-columns: repeat(2, 1fr);
}

.drawing-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.drawing-card__media {
  position: relative;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-100);
  min-height: 220px;
  display: grid;
  place-items: center;
}

.drawing-card__img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: contain;
  padding: 0.75rem;
  background: var(--white);
}

.drawing-card__img.is-missing {
  display: none;
}

.drawing-placeholder {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  min-height: 220px;
  color: var(--gray-400);
  font-size: 0.9rem;
  text-align: center;
  padding: 1rem;
}

.drawing-card__img.is-missing + .drawing-placeholder {
  display: flex;
}

.drawing-placeholder code {
  font-size: 0.75rem;
  color: var(--brand-dark);
  background: var(--brand-pale);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.drawing-card__body {
  padding: 1.15rem 1.25rem 1.35rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.drawing-card__tag {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--brand);
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.drawing-card__body h3 {
  color: var(--navy);
  font-size: 1.35rem;
  margin: 0 0 0.65rem;
}

.drawing-card__meta {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  color: var(--gray-600);
  font-size: 0.88rem;
  line-height: 1.7;
}

.drawing-card__btn {
  margin-top: auto;
  width: 100%;
  text-align: center;
}

@media (max-width: 900px) {
  .drawing-grid,
  .drawing-grid--4 {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 560px) {
  .drawing-grid,
  .drawing-grid--4 {
    grid-template-columns: 1fr;
  }
}

/* Drawing lightbox modal */
.drawing-modal {
  position: fixed;
  inset: 0;
  z-index: 400;
  display: grid;
  place-items: center;
  padding: 1.25rem;
}

.drawing-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(13, 45, 74, 0.65);
}

.drawing-modal__panel {
  position: relative;
  z-index: 1;
  background: var(--white);
  border-radius: 12px;
  width: min(920px, 100%);
  max-height: min(92vh, 900px);
  overflow: auto;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.drawing-modal__close {
  position: absolute;
  top: 0.7rem;
  right: 0.85rem;
  z-index: 2;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  border-radius: 999px;
  background: var(--gray-50);
  color: var(--gray-600);
  font-size: 1.45rem;
  line-height: 1;
  cursor: pointer;
}

.drawing-modal__close:hover {
  background: var(--brand-pale);
  color: var(--brand-dark);
}

.drawing-modal__media {
  position: relative;
  background: #f7f9fb;
  border-bottom: 1px solid var(--gray-100);
  display: grid;
  place-items: center;
  padding: 1.25rem 1.5rem 1rem;
}

.drawing-modal__img {
  display: block;
  width: 100%;
  aspect-ratio: 5 / 2;
  max-height: min(52vh, 480px);
  object-fit: contain;
  object-position: center;
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: 8px;
  image-rendering: auto;
  -webkit-optimize-contrast: auto;
}

.drawing-modal__img.is-missing {
  display: none;
}

.drawing-modal__placeholder {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  min-height: 0;
  aspect-ratio: 5 / 2;
  width: 100%;
  max-height: min(52vh, 480px);
  border: 2px dashed var(--gray-100);
  border-radius: 8px;
  background: var(--white);
  color: var(--gray-400);
  text-align: center;
  padding: 1.5rem;
  font-size: 0.95rem;
}

.drawing-modal__img.is-missing + .drawing-modal__placeholder {
  display: flex;
}

.drawing-modal__open {
  margin: 0.65rem 0 0;
  text-align: center;
  font-size: 0.84rem;
}

.drawing-modal__open a {
  color: var(--brand-dark);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.drawing-modal__open a:hover {
  color: var(--brand);
}

.drawing-modal__placeholder code {
  font-size: 0.78rem;
  color: var(--brand-dark);
  background: var(--brand-pale);
  padding: 0.3rem 0.55rem;
  border-radius: 4px;
}

.drawing-modal__body {
  padding: 1.35rem 1.5rem 1.6rem;
}

.drawing-modal__tag {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--brand);
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.drawing-modal__body h3 {
  color: var(--navy);
  font-size: 1.35rem;
  margin: 0 0 0.75rem;
}

.drawing-modal__meta {
  list-style: none;
  margin: 0 0 0.85rem;
  padding: 0;
  color: var(--gray-600);
  font-size: 0.9rem;
  line-height: 1.75;
}

.drawing-modal__note {
  margin: 0 0 1.15rem;
  font-size: 0.84rem;
  color: var(--gray-400);
  line-height: 1.7;
}

.drawing-modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.drawing-modal__actions .btn {
  min-width: 140px;
  text-align: center;
}

button.power-chip {
  font: inherit;
  cursor: pointer;
}

@media (max-width: 640px) {
  .drawing-modal {
    padding: 0.75rem;
    align-items: end;
  }

  .drawing-modal__panel {
    max-height: 94vh;
    border-radius: 12px 12px 8px 8px;
  }

  .drawing-modal__media {
    padding: 1rem;
  }

  .drawing-modal__img {
    max-height: 38vh;
  }

  .drawing-modal__actions {
    flex-direction: column;
  }

  .drawing-modal__actions .btn {
    width: 100%;
  }
}

.inquiry-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.inquiry-steps li {
  display: flex;
  gap: 0.85rem;
  position: relative;
  padding-bottom: 1.1rem;
}

.inquiry-steps li:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 34px;
  bottom: 0;
  width: 2px;
  background: var(--gray-100);
}

.inquiry-steps li:last-child {
  padding-bottom: 0;
}

.inquiry-steps__no {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--brand);
  color: var(--white);
  font-weight: 700;
  font-size: 0.95rem;
  display: grid;
  place-items: center;
  z-index: 1;
}

.inquiry-steps strong {
  display: block;
  color: var(--navy);
  font-size: 0.95rem;
  margin-bottom: 0.15rem;
}

.inquiry-steps p {
  margin: 0;
  color: var(--gray-600);
  font-size: 0.86rem;
  line-height: 1.65;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  box-shadow: var(--shadow);
}

.faq-item summary {
  padding: 1rem 1.25rem;
  font-weight: 600;
  color: var(--navy);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 2.5rem;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--brand);
  font-size: 1.25rem;
  font-weight: 400;
  line-height: 1;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  margin: 0;
  padding: 0 1.25rem 1.15rem;
  color: var(--gray-600);
  font-size: 0.92rem;
  line-height: 1.85;
}

.voltage-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  max-width: 560px;
}

.voltage-card {
  display: block;
  padding: 1.5rem;
  background: var(--white);
  border: 2px solid var(--gray-100);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.voltage-card:hover {
  border-color: var(--brand);
  box-shadow: var(--shadow-lg);
}

.voltage-card strong {
  display: block;
  font-size: 1.5rem;
  color: var(--navy);
  margin-bottom: 0.35rem;
}

.voltage-card span {
  font-size: 0.88rem;
  color: var(--gray-600);
}

/* Feature strip */
.feature-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0;
  border: 1px solid var(--gray-100);
}

.feature-item {
  padding: 2rem 1.5rem;
  text-align: center;
  border-right: 1px solid var(--gray-100);
}

.feature-item:last-child {
  border-right: none;
}

.feature-item strong {
  display: block;
  font-size: 1.25rem;
  color: var(--brand);
  margin-bottom: 0.25rem;
}

.feature-item span {
  font-size: 0.88rem;
  color: var(--gray-600);
}

/* Page header */
.page-header {
  background: var(--navy);
  color: var(--white);
  padding: 3rem 0 2.5rem;
}

.page-header h1 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin-bottom: 0.4rem;
}

.page-header p {
  color: rgba(255, 255, 255, 0.8);
}

.breadcrumb {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 0.75rem;
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.8);
}

.breadcrumb a:hover {
  color: var(--white);
}

/* About page */
.about-intro {
  max-width: 760px;
}

.about-intro p {
  color: var(--gray-600);
  margin-bottom: 1rem;
  font-size: 1.02rem;
}

.value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.value-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  border-left: 4px solid var(--brand);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.value-card h3 {
  color: var(--navy);
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.value-card p {
  color: var(--gray-600);
  font-size: 0.93rem;
  line-height: 1.75;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.why-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  padding: 1.75rem 1.5rem 1.85rem;
  box-shadow: var(--shadow);
  position: relative;
}

.why-card__no {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--brand);
  margin-bottom: 0.85rem;
}

.why-card h3 {
  color: var(--navy);
  font-size: 1.2rem;
  margin: 0 0 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--brand-light);
}

.why-card p {
  color: var(--gray-600);
  font-size: 0.93rem;
  line-height: 1.8;
  margin: 0;
}

@media (max-width: 800px) {
  .why-grid {
    grid-template-columns: 1fr;
  }
}

.app-section-title {
  margin-bottom: 2rem;
}

.app-group {
  margin-bottom: 2.5rem;
}

.app-group h3 {
  color: var(--navy);
  font-size: 1.2rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--brand-light);
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.app-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  padding: 1.25rem 1.35rem;
  transition: box-shadow 0.2s, transform 0.2s;
}

.app-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.app-card strong {
  display: block;
  color: var(--navy);
  margin-bottom: 0.35rem;
  font-size: 0.98rem;
}

.app-card span {
  color: var(--gray-600);
  font-size: 0.88rem;
  line-height: 1.65;
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem 1.5rem;
}

.feature-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: var(--white);
  border: 1px solid var(--gray-100);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
}

.feature-list__no {
  flex: 0 0 auto;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--brand);
  line-height: 1.4;
  margin-top: 0.15rem;
}

.feature-list strong {
  display: block;
  color: var(--navy);
  font-size: 1.02rem;
  margin-bottom: 0.4rem;
}

.feature-list p {
  margin: 0;
  color: var(--gray-600);
  font-size: 0.92rem;
  line-height: 1.75;
}

@media (max-width: 720px) {
  .feature-list {
    grid-template-columns: 1fr;
  }
}

.feature-list--compact {
  margin-bottom: 0;
}

.rotor-compare {
  margin: 0 0 2.25rem;
  padding: 0 0 2rem;
  border-bottom: 1px solid var(--gray-100);
}

.rotor-compare__head {
  max-width: 720px;
  margin-bottom: 1.5rem;
}

.rotor-compare__head h3 {
  color: var(--navy);
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
}

.rotor-compare__head p {
  margin: 0;
  color: var(--gray-600);
  font-size: 0.95rem;
  line-height: 1.8;
}

.rotor-compare__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.rotor-compare__col {
  border: 1px solid var(--gray-100);
  border-left: 4px solid var(--gray-400);
  padding: 1.35rem 1.4rem 1.5rem;
  background: var(--white);
}

.rotor-compare__col--ours {
  border-left-color: var(--brand);
  background: var(--brand-pale);
}

.rotor-compare__label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--brand);
  margin-bottom: 0.35rem;
}

.rotor-compare__col:not(.rotor-compare__col--ours) .rotor-compare__label {
  color: var(--gray-600);
}

.rotor-compare__col strong {
  display: block;
  color: var(--navy);
  font-size: 1.15rem;
  margin-bottom: 0.85rem;
}

.rotor-compare__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.rotor-compare__col li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.55rem;
  color: var(--gray-600);
  font-size: 0.92rem;
  line-height: 1.65;
}

.rotor-compare__col li:last-child {
  margin-bottom: 0;
}

.rotor-compare__col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--brand);
}

.rotor-compare__col:not(.rotor-compare__col--ours) li::before {
  background: var(--gray-400);
}

@media (max-width: 720px) {
  .rotor-compare__grid {
    grid-template-columns: 1fr;
  }
}

.section--gray .feature-list li {
  background: var(--white);
}

.section:not(.section--gray) .feature-list li {
  background: var(--gray-50);
}

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.form-group {
  margin-bottom: 0.25rem;
}

.form-group--full {
  grid-column: 1 / -1;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 0.35rem;
}

.form-group label .required {
  color: #e53e3e;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border: 1px solid #d1dce6;
  border-radius: var(--radius);
  font: inherit;
  background: var(--white);
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(0, 136, 204, 0.15);
}

.form-group textarea {
  min-height: 130px;
  resize: vertical;
}

.form-card {
  background: var(--white);
  border: 1px solid var(--gray-100);
  padding: 2rem;
  box-shadow: var(--shadow);
}

/* Contact */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2rem;
  align-items: start;
}

.info-card {
  background: var(--brand-pale);
  border-left: 4px solid var(--brand);
  padding: 1.75rem;
  margin-bottom: 1.25rem;
}

.info-card h3 {
  color: var(--navy);
  font-size: 1rem;
  margin-bottom: 1rem;
}

.info-row {
  display: flex;
  gap: 0.85rem;
  margin-bottom: 1rem;
  font-size: 0.93rem;
}

.info-row:last-child {
  margin-bottom: 0;
}

.info-row__label {
  font-weight: 600;
  color: var(--navy);
  min-width: 4.5rem;
  flex-shrink: 0;
}

.info-row__value {
  color: var(--gray-600);
}

.info-row__value a {
  color: var(--brand);
}

.info-row__value a:hover {
  text-decoration: underline;
}

/* CTA band */
.cta-band {
  background: linear-gradient(90deg, var(--brand-dark), var(--brand));
  color: var(--white);
  padding: 2.5rem 0;
  text-align: center;
}

.cta-band h2 {
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
}

.cta-band p {
  opacity: 0.9;
  margin-bottom: 1.25rem;
}

/* Footer */
.site-footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.75);
  padding: 3rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-grid h4 {
  color: var(--white);
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
}

.footer-grid p,
.footer-grid li {
  font-size: 0.88rem;
  line-height: 1.8;
}

.footer-grid ul {
  list-style: none;
}

.footer-grid a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 1.25rem;
  font-size: 0.82rem;
  text-align: center;
}

/* App-style social icons */
.social-sidebar {
  position: fixed;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.app-icon {
  position: relative;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: block;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s, box-shadow 0.2s;
  overflow: visible;
}

.app-icon__tooltip {
  position: absolute;
  right: calc(100% + 10px);
  top: 50%;
  transform: translate(6px, -50%);
  padding: 0.38rem 0.72rem;
  background: var(--navy);
  color: var(--white);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  white-space: nowrap;
  border-radius: 6px;
  box-shadow: 0 4px 14px rgba(13, 45, 74, 0.22);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  z-index: 1;
}

.app-icon__tooltip::after {
  content: "";
  position: absolute;
  left: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 6px solid transparent;
  border-left-color: var(--navy);
}

.app-icon:hover .app-icon__tooltip,
.app-icon:focus-visible .app-icon__tooltip {
  opacity: 1;
  visibility: visible;
  transform: translate(0, -50%);
}

.app-icon:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
}

.app-icon:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.28);
}

.app-icon svg {
  width: 48px;
  height: 48px;
  display: block;
  border-radius: 12px;
  overflow: hidden;
}

.app-icon--line,
.app-icon--wechat,
.app-icon--whatsapp,
.app-icon--mail {
  background: transparent;
}

/* WeChat modal */
.wechat-modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: grid;
  place-items: center;
}

.wechat-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(13, 45, 74, 0.55);
}

.wechat-modal__panel {
  position: relative;
  background: var(--white);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  max-width: 320px;
  width: 90%;
  box-shadow: var(--shadow-lg);
}

.wechat-modal__close {
  position: absolute;
  top: 0.75rem;
  right: 0.85rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--gray-400);
  cursor: pointer;
  line-height: 1;
}

.wechat-modal__icon {
  margin: 0 auto 1rem;
  width: 56px;
  height: 56px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.wechat-modal__icon svg {
  width: 56px;
  height: 56px;
  display: block;
}

.wechat-modal__panel h3 {
  color: var(--navy);
  margin-bottom: 0.5rem;
}

.wechat-modal__id {
  font-size: 0.9rem;
  color: var(--gray-600);
  margin-bottom: 1rem;
}

.wechat-modal__qr-wrap {
  margin: 0 auto 0.75rem;
  padding: 12px;
  background: #fff;
  border: 1px solid var(--gray-100);
  border-radius: 8px;
  width: fit-content;
  max-width: 100%;
}

.wechat-modal__qr {
  display: block;
  width: 260px;
  height: 260px;
  object-fit: contain;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.wechat-modal__open {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
}

.wechat-modal__open a {
  color: var(--brand-dark);
  font-weight: 600;
  text-decoration: underline;
}

.wechat-modal__open a:hover {
  color: var(--brand);
}

.wechat-modal__qr-placeholder {
  width: 180px;
  height: 180px;
  margin: 0 auto 1rem;
  background: var(--gray-50);
  border: 2px dashed var(--gray-100);
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 0.82rem;
  color: var(--gray-400);
  line-height: 1.5;
}

.wechat-modal__hint {
  font-size: 0.82rem;
  color: var(--gray-400);
}

.form-note {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: var(--gray-50);
  border-left: 3px solid var(--brand);
  border-radius: 4px;
  color: var(--gray-600);
  font-size: 0.9rem;
  line-height: 1.7;
}

.form-sent-notice {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  background: #eaf6ee;
  border: 1px solid #bfe3cb;
  border-radius: 6px;
  color: #1e5e34;
  font-size: 0.93rem;
  line-height: 1.8;
}

.form-sent-notice strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 1rem;
}

.form-sent-notice a {
  color: #1e5e34;
  font-weight: 600;
  text-decoration: underline;
}

@media (max-width: 900px) {
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    width: 100%;
  }

  .nav-cta {
    margin-left: 0;
  }

  .feature-item {
    border-right: none;
    border-bottom: 1px solid var(--gray-100);
  }

  .social-sidebar {
    top: auto;
    bottom: 16px;
    right: 16px;
    transform: none;
    flex-direction: row;
  }

  .app-icon {
    width: 42px;
    height: 42px;
    border-radius: 10px;
  }

  .app-icon__tooltip {
    right: auto;
    left: 50%;
    top: auto;
    bottom: calc(100% + 8px);
    transform: translate(-50%, 6px);
  }

  .app-icon__tooltip::after {
    left: 50%;
    top: 100%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--navy);
    border-left-color: transparent;
  }

  .app-icon:hover .app-icon__tooltip,
  .app-icon:focus-visible .app-icon__tooltip {
    transform: translate(-50%, 0);
  }

  .app-icon svg {
    width: 24px;
    height: 24px;
  }
}